Overview of Volatile Organic Compounds

December 18, 2021

    Volatile Organic Compounds (VOCs) are the most common pollutants emitted by petrochemical processes and various industries that use organic solvents, such as painting, printing, degreasing, adhesives, pharmaceuticals, plastics, and rubber processing. They may contain benzene. , Alcohols, ketones, aldehydes, phenols, ethers, alkanes and inorganic pollutants such as NOx, SO2, water vapor, HCl, Cl2, most of these compounds have pungent odors and toxicity, and some have been classified as carcinogens, such as vinyl chloride , Benzene, polycyclic aromatic hydrocarbons, etc., among which benzene damages the hematopoietic function of human bones, and toluene and xylene have a strong anesthetic effect on the central nervous system; some VOCs react with NOx under sunlight to form photochemical smog Hazards to human health; some VOCs have a destructive effect on the ozone layer, such as radon fluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs); and most VOCs are flammable and explosive, posing a threat to the safety of enterprises.


2. RTO regenerative incineration technology


    The heat treatment method used to control the emission of VOCs has continued to develop over time. At first, the direct combustion method was used, and then it developed into thermal oxidation and closed combustion, and then developed into a heat exchange thermal oxidizer. It was only in the 1970s. It has developed into a RTO (Regenerative Thermal Oxidizer) system with higher thermal efficiency. However, the RTO equipment at that time was simple, with a small processing capacity, and the destruction and removal efficiency of organic matter was not very high. In recent years, with the continuous improvement of technology, the performance of RTO equipment More and more perfect.


    RTO (Regenerative Thermal Oxidizer), regenerative thermal oxidation decomposer, also known as regenerative incinerator. This technology is to heat the organic waste gas to high temperature (above 750°C) and directly oxidize and decompose it into CO2 and H2O to harmlessly treat waste gas pollutants and recover the heat generated during decomposition. It is a high-efficiency and energy-saving treatment of high-concentration organic waste gas. Environmental protection device.


    The RTO regenerative combustion process can be divided into stationary and rotary combustion. The stationary regenerative combustion process includes two-chamber, three-chamber, five-chamber, etc. Theoretically, the greater the number of heat storage, the higher the purification efficiency. The two-chamber RTO regenerative combustion process The VOCs removal rate of the incinerator is 95~98%, and the VOCs removal rate of the three-chamber RTO regenerative incinerator can reach more than 98%, but the equipment investment or land occupation will increase accordingly. Rotary RTO devices include rotary cylinder type, disc type and rotary valve type. The rotary RTO structure is the same as the fixed type except for the drive area and the distribution area. In general, the combustion process considers the three-chamber fixed regenerative combustion process. More, the rotary valve type combustion process can be considered when the area is limited.

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